Beans, Tuscan-style, slow cooker

Ingredients

• 1 tablespoon olive oil
• 3 ounces pancetta or bacon, finely chopped
• 1 large red onion, finely chopped
• 4 cloves garlic, minced
• 2 sprigs fresh rosemary or 1 tablespoon dried rosemary leaves
• 1/4 c. parsley leaves
• 1/2 tsp. salt
• Freshly ground pepper
• 1 can (28 ounces) tomatoes
• 2 can (19 oz each) white kidney or cannellini beans, drained